Fluid Mechanics Seminar: Anthony Wachs
- Date: 09/04/2014
- Time: 16:00
Fluid Mechanics Department, IFP Energies nouvelles, Solaize, France
Anthony Wachs received in BS & MS from the University Louis Pasteur of Strasbourg and his PhD from the Institut National Polytechnique of Grenoble in 2000. Right after, he was hired in 2001 as a Fluid Mechanics research engineer at IFP Energies nouvelles (IFPEN, at that time Institut Français du Pétrole) in Paris. In 2009, he spent a one-year sabbatical at the nuclear research center of Cadarache in the south of France, where he worked for IRSN (the french national safety administration for nuclear energy). In 2010, he get his HDR (French Habilitation to Supervise Research) and was later promoted Scientific Advisor at IFPEN in Multiphase Flows and Scientific Computing. He is currently based in IFPEN-Lyon where he supervises a group of researchers (including PhD and post-doc students) on the numerical simulation of reactive particulate flows (www.peligriff.com). His main research interests are non-Newtonian Flows, Multiphase Flows and High Performance Computing. He collaborates extensively with academic groups in Canada, Brazil, France and Germany and his group publishes from 2 to 4 papers a year in international journals.
University of British Columbia
Multi-scale modeling of particulate flows
There is still much to understand in the dynamics of particulate flows, even for mono-disperse spheres suspended in a Newtonian fluid. The major difficulty in terms of comprehension and modeling is the broad range of scales in the system: from the particle to the flow domain. Indeed, the large-scale dynamics are controlled by the small-scale interactions between the particles and the surrounding fluid, as well as between the particles themselves as they contact. In the framework of a multi-scale analysis, I review the models for finite-size particles at the different scales, i.e. the micro, meso and macro-scale models, and present the conceptual assumptions that are generally used to derive them. I briefly introduce the numerical methods implemented in our code PeliGRIFF to investigate particulate flow dynamics at the micro and meso scales, namely Fictitious Domain and two-way Euler Lagrange for fluid/solid momentum exchange and Discrete Element Method for solid/solid collisions, and present their main numerical and computational features. Then, I illustrate what can be achieved with this type of numerical tool on various flow configurations (including heat and mass transfer) ranging from Stokes to inertial regimes, but also discuss the current inherent limitations in terms of computations. Finally, I suggest how these simulations can contribute both to extend our understanding of the intricate transfer mechanisms taking place in these flows and to improve the design of the related industrial processes as, e.g., fluidized beds in catalytic cracking and biomass conversion.
Location: ESB 2012